Electric Bulbs

Q.

Consider the potentiometer circuit shown in the figure below. The potentiometer wire is 600 cm long. At what distance from point A should the jockey be placed to get zero deflection in the galvanometer?

1. 320 cm

2. 500 cm

3. 250 cm

4. 430 cm

Q.

Consider the potentiometer circuit shown in the figure below. The potentiometer wire is 600 cm long. At what distance from point A should the jockey be placed to get zero deflection in the galvanometer?

1. 320 cm

2. 500 cm

3. 250 cm

4. 430 cm

Q. Figure below shows a circuit which may be used to compare the resistance $R$ of an unknown resistor with a $100\Omega$ standard. The distances $l$ from one end of the potentiometer slider wire to the balance point are 400 mm and 588 mm when X is connected to Y and Z respectively. The length of the slide is 1.00 m. What is the value of resistance R?

1. $32\Omega$
2. $47\Omega$
3. $68\Omega$
4. $147\Omega$

Q. In the circuit diagram, all the bulbs are identical. Which bulb will be the brightest?

1. A
2. B
3. C
4. D

Q. a circuit containing inductor, bulb and battery has a switch, the bulb will become suddenly bright if

1. Contact is made or broken
2. Contact is made
3. Contact is broken
4. Won't become bright at all